Q5 of 83 Page 85

Solve the following equations using the general formula:

x2 + 5x — 1 = 0

Comparing equation x2 + 5x — 1 = 0 with ax2 + bx + c = 0 we get


a = 1, b = 5 and c = – 1


Discriminant (D) = b2 – 4ac


⇒ D = 52 – 4(1)(– 1)


⇒ D = 25 + 4


⇒ D = 29


D > 0 implies roots are real and distinct and given by




Therefore and


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